A reader pointed me to this announcement at the official website for some band called Sleater-Kinney:

Urban Outfitters, the store dedicated to reselling your childhood back to you via nostalgia and irony based fashion, is selling a T-shirt that says:
“Voting is For Old People”
Unless you are under the age of 18, this shirt will be banned from all Sleater-Kinney shows.
ARE YOU REGISTERED TO VOTE?
Have a good March.